brainfuck

My personal playground for Brainfuck interpreters in Java. Come in different flavours.

Backed by a set of common interfaces, this Brainfuck interpreter is made to independently exchange implementations of all major components, especially

• Tape (cf. de.fxnn.brainfuck.tape)
• Instruction Set and Interpreter (cf. de.fxnn.brainfuck.interpreter)
• Program source (cf. de.fxnn.brainfuck.program)

Also note the github.com/fxnn/brainfuck-on-genetics project implementing genetic algorithms on top of this interpreter.

Usage

From commandline:

$ git clone https://github.com/fxnn/brainfuck
$ mvn package
$ java -jar target\brainfuck-1.0-SNAPSHOT-jar-with-dependencies.jar

usage: java -jar brainfuck.jar [options] program1 [program2 [...]]
http://github.com/fxnn/brainfuck
 -a,--progarg             Give brainfuck source as commandline argument.
 -e,--eof <0|-1|TERM>     Controls how to behave after reading an EOF
 -h,--help                Display usage information.
 -i,--infile <PATH>       Read input from file
 -o,--outfile <PATH>      Write output to file
    --progenc <CHARSET>   Use given encoding for programs
    --tapeenc <CHARSET>   Use given encoding for tape, input and output
By default, program names are paths to files containing programs. Programs
are executed sequentially on different tapes. To read a single program
from stdin, use "-" as program name.

Or from your JVM program:

public class BrainfuckRunner {
  
  public static void main(String[] args) {
    Runnable programExecutor = new ProgramExecutor(
        new StringProgram(",[->+<]>."),
        new BrainfuckInterpreter(
            new InfiniteCharacterTape(StandardCharsets.UTF_8, TapeEofBehaviour.READS_ZERO),
            javaIoDataInput,
            javaIoDataOutput
        )
    );
    programExecutor.run();
  }
}

Brainfuck can be found in Maven Central.

<dependency>
  <groupId>de.fxnn</groupId>
  <artifactId>brainfuck</artifactId>
  <version>1.3.0</version>
</dependency>

Components

• Tapes
• infinite tape of signed 32 bit integers (cf. InfiniteSignedIntegerTape)
• infinite tape of characters in all charsets supported by Java API (cf. InfiniteCharacterTape)
• Programs
• source managed as single string (cf. StringProgram)
• source managed in a tree whose leafs are regular string-sourced programs (cf. TreeProgram)

Related Work

• This project was never designed to (and does terribly fail at) execute Brainfuck code fast. For this problem being solved with Java in a variety of ways, you might consider github.com/Borisvl/brainfuck. (Did anyone say "bytecode"?)
• While I am also working on a project involving machine learning, I haven't been the first to come to this idea. It follows that others are more advanced in their solution. Take github.com/primaryobjects/AI-Programmer, who even played with Brainfuck extensions supporting functions and published some really interesting articles about everything.

License

Licensed under MIT, see for LICENSE file.